A warning label for vehicles and a method for manufacturing the same

Abstract

The application relates to the technical field of automobile part manufacturing, in particular to a warning label for vehicles and a preparation method thereof. The warning label for vehicles comprises a release paper layer and a substrate layer, and the release paper layer and the substrate layer are bonded through glue; the glue is composed of raw materials containing the following components in parts by weight: modified polyacrylic acid resin 50-80 parts, tannic acid 10-25 parts and zinc powder 5-15 parts; each part of the modified polyacrylic acid resin is made of raw materials containing the following components in parts by weight: acrylic acid 15-25 parts, N-allyl carbazole 5-10 parts, vinyl imidazole 5-10 parts and acrylic ester monomer 40-60 parts. The warning label for vehicles prepared by the application has good high-temperature resistance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile part manufacturing, and more particularly to a warning label for vehicles and a preparation method thereof. BACKGROUND

[0002] According to data released by the China Association of Automobile Manufacturers, in 2020, the production and sales of automobiles reached 25.225 million, and electrification, intelligentization and networking became new opportunities for the development of the automobile industry. The Chinese automobile market will also usher in a better development period. The total sales of automobiles in 2021 are expected to reach 26.3 million, and the automobile market will also steadily grow in the next five years. The automobile sales in 2025 are expected to reach 30 million.

[0003] With the rapid development of the automobile industry, people have higher and higher requirements for automobiles. Based on the warning and decoration needs, manufacturers usually attach warning labels to automobiles, such as the sun visor of the front passenger seat and the bumper of the automobile. In the related art, the warning label for vehicles usually comprises a release paper layer and a substrate layer, and the release paper and the substrate layer are usually bonded by glue. However, the current glue has poor high-temperature resistance. When the warning label for vehicles is in a high-temperature environment, the bonding strength of the glue may decrease, and the warning label for vehicles may be curled, thereby affecting the warning effect of the warning label for vehicles, and even eventually losing the warning effect. SUMMARY

[0004] In order to solve the problem of poor high-temperature resistance of the warning label for vehicles, the application provides a warning label for vehicles and a preparation method thereof.

[0005] In the first aspect, the application provides a warning label for vehicles, which adopts the following technical scheme:

[0006] A warning label for vehicles comprises a release paper layer and a substrate layer, and the release paper layer and the substrate layer are bonded by glue. The glue is composed of raw materials in the following proportions by weight: 50-80 parts of modified polyacrylic acid resin, 10-25 parts of tannic acid and 5-15 parts of zinc powder. Each part of the modified polyacrylic acid resin is made of raw materials in the following proportions by weight: 15-25 parts of acrylic acid, 5-10 parts of N-allyl carbazole, 5-10 parts of vinyl imidazole and 40-60 parts of acrylic ester monomer.

[0007] By adopting the technical scheme, the modified polyacrylic acid resin is prepared by taking N-allyl carbazole and vinyl imidazole as raw materials, both of which contain cyclic structures with high temperature resistance, so that the modified polyacrylic acid resin prepared has good high temperature resistance; the glue is prepared by taking the modified polyacrylic acid resin, tannic acid and zinc powder with high temperature resistance as raw materials, the tannic acid can be crosslinked with the modified polyacrylic acid resin through hydrogen bond on one hand, and can be chelated with the zinc powder on the other hand, forming a network structure with high crosslinking degree, the network structure with high crosslinking degree has good high temperature resistance, and meanwhile improves the dispersion performance of the zinc powder in the glue, so that the high temperature resistance of the zinc powder is fully exerted.

[0008] In summary, the modified polyacrylic acid resin, the tannic acid and the zinc powder cooperate with each other to jointly prepare the glue with good high temperature resistance, and the glue is used for preparing the warning label for vehicles, so that the warning label for vehicles with good high temperature resistance can be obtained.

[0009] Preferably, the modified polyacrylic acid resin is 70-80 parts by weight.

[0010] Preferably, the zinc powder is 10-15 parts by weight.

[0011] Preferably, the raw materials of the glue further comprise 5-10 parts of acetylacetone aluminum.

[0012] By adopting the technical scheme, the carbonyl in the acetylacetone aluminum can be crosslinked with the modified polyacrylic acid resin and the tannic acid through hydrogen bond, and the aluminum in the acetylacetone aluminum can be chelated with the tannic acid, so that the crosslinking degree of the network structure is further increased, the high temperature resistance of the glue is further improved, and the high temperature resistance of the warning label for vehicles is further improved.

[0013] Preferably, the acrylic ester monomer is one or more of butyl acrylate, isooctyl acrylate, hydroxypropyl acrylate and methyl methacrylate.

[0014] Preferably, the acrylic ester monomer is compounded by isooctyl acrylate and methyl methacrylate according to a mass ratio of (2-5):1.

[0015] Preferably, the raw materials of the glue further comprise 5-15 parts of a crosslinking agent.

[0016] Preferably, the crosslinking agent is compounded by polypropylene adipate and chitosan according to a mass ratio of 1:(5-10).

[0017] By adopting the technical scheme, the crosslinking agent prepared by compounding polypropylene glycol adipate and chitosan according to a specific mass ratio is used as a raw material of the glue, which can not only improve the crosslinking degree of the network structure, but also improve the compatibility of the components in the glue, so that the components are uniformly blended, and the high-temperature resistance of the glue is further improved.

[0018] In a second aspect, the application provides a preparation method of a warning label for vehicles, which adopts the following technical scheme:

[0019] The preparation method of the warning label for vehicles comprises the following steps:

[0020] The glue is coated on one side of the substrate layer and dried to form an adhesive layer, a release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer, and finally a warning mark is printed on the side of the substrate layer away from the adhesive layer to obtain the warning label for vehicles.

[0021] In summary, the application has the following beneficial effects:

[0022] 1. The modified polyacrylic acid resin is prepared by using N-allylcarbazole and vinyl imidazole as raw materials, and the modified polyacrylic acid resin has good high-temperature resistance. The glue is prepared by using the modified polyacrylic acid resin, tannic acid and high-temperature-resistant zinc powder as raw materials. The tannic acid can be crosslinked with the modified polyacrylic acid resin through hydrogen bonds and can be chelated with zinc powder, forming a network structure with high crosslinking degree and improving the dispersion performance of zinc powder in the glue, so that the high-temperature resistance of zinc powder is fully utilized. The modified polyacrylic acid resin, tannic acid and zinc powder cooperate with each other to prepare the glue with good high-temperature resistance. The glue is used for preparing the warning label for vehicles, and the warning label for vehicles with good high-temperature resistance can be obtained.

[0023] 2. In the application, the crosslinking agent is prepared by compounding polypropylene glycol adipate and chitosan according to a specific mass ratio. The crosslinking agent used as a raw material of the glue can not only improve the crosslinking degree of the network structure in the glue system, but also improve the compatibility of the components in the glue, so that the components are uniformly blended, and the high-temperature resistance of the glue is further improved. DETAILED DESCRIPTION

[0024] The application will be further described in detail below in combination with examples.

[0025] Unless otherwise specified, the specifications of the raw materials used in the following examples and comparative examples are shown in Table 1.

[0026] Table 1. Raw material specification information

[0027] Raw material Specification PVC film Article No. 32535 Polypropylene adipate Article No. 25101-03-5 Chitosan Article No. CX123664

[0028] Preparation Example of Modified Polyacrylic Acid Resin

[0029] Preparation Example A

[0030] Modified polyacrylic acid resin, whose formulation is as follows:

[0031] Acrylic acid 1.5 kg, N-allylcarbazole 0.5 kg, vinyl imidazole 0.5 kg, acrylic ester monomer 4 kg (prepared by compounding isooctyl acrylate and methyl methacrylate according to a mass ratio of 2:1), acetone 10 kg, initiator dibenzoyl peroxide 0.1 kg.

[0032] Modified polyacrylic acid resin, which is prepared according to the following steps:

[0033] Acrylic acid, N-allylcarbazole, vinyl imidazole, acrylic ester monomer and 8 kg of acetone are mixed, and the temperature is increased to 80°C while stirring, the temperature is kept constant, the remaining acetone and initiator are added within 2.5 h, and then the reaction is kept for 3 h, and then the temperature is decreased to 25°C, to obtain the modified polyacrylic acid resin.

[0034] Preparation Example B

[0035] Modified polyacrylic acid resin, whose formulation is as follows:

[0036] Acrylic acid 2.5 kg, N-allylcarbazole 1 kg, vinyl imidazole 1 kg, acrylic ester monomer 6 kg (prepared by compounding isooctyl acrylate and methyl methacrylate according to a mass ratio of 5:1), acetone 15 kg, initiator dibenzoyl peroxide 0.3 kg.

[0037] Modified polyacrylic acid resin, which is prepared according to the following steps:

[0038] Acrylic acid, N-allylcarbazole, vinyl imidazole, acrylic ester monomer and 12 kg of acetone are mixed, and the temperature is increased to 80°C while stirring, the temperature is kept constant, the remaining acetone and initiator are added within 2.5 h, and then the reaction is kept for 3 h, and then the temperature is decreased to 25°C, to obtain the modified polyacrylic acid resin.

[0039] Preparation Example C

[0040] Modified polyacrylic acid resin, whose formulation is as follows:

[0041] Acrylic acid 2 kg, N-allylcarbazole 0.8 kg, vinyl imidazole 0.8 kg, acrylic ester monomer 5 kg (prepared by compounding isooctyl acrylate and methyl methacrylate according to a mass ratio of 3:1), acetone 12 kg, initiator dibenzoyl peroxide 0.2 kg.

[0042] Modified polyacrylic acid resin, which is prepared according to the following steps:

[0043] Mix acrylic acid, N-allylcarbazole, vinyl imidazole, acrylate monomer and 9 kg of acetone, while stirring, warm to 80°C, keep the temperature constant, add the remaining acetone and initiator within 2.5 h, keep the temperature constant for another 3 h, cool to 25°C, to obtain the modified polyacrylic acid resin.

[0044] Preparation Example D

[0045] Modified polyacrylic acid resin, whose formula is as follows:

[0046] Acrylic acid 1.5 kg, N-allylcarbazole 0.5 kg, vinyl imidazole 0.5 kg, acrylate monomer 4 kg (isooctyl acrylate), acetone 10 kg, initiator dibenzoyl peroxide 0.1 kg.

[0047] Modified polyacrylic acid resin, which is prepared according to the following steps:

[0048] Mix acrylic acid, N-allylcarbazole, vinyl imidazole, acrylate monomer and 8 kg of acetone, while stirring, warm to 80°C, keep the temperature constant, add the remaining acetone and initiator within 2.5 h, keep the temperature constant for another 3 h, cool to 25°C, to obtain the modified polyacrylic acid resin.

[0049] Preparation Example E

[0050] Modified polyacrylic acid resin, whose formula is as follows:

[0051] Acrylic acid 1.5 kg, N-allylcarbazole 0.5 kg, vinyl imidazole 0.5 kg, acrylate monomer 4 kg (methyl methacrylate), acetone 10 kg, initiator dibenzoyl peroxide 0.1 kg.

[0052] Modified polyacrylic acid resin, which is prepared according to the following steps:

[0053] Mix acrylic acid, N-allylcarbazole, vinyl imidazole, acrylate monomer and 8 kg of acetone, while stirring, warm to 80°C, keep the temperature constant, add the remaining acetone and initiator within 2.5 h, keep the temperature constant for another 3 h, cool to 25°C, to obtain the modified polyacrylic acid resin.

[0054] Preparation of modified polyacrylic acid resin

[0055] Preparation Example A

[0056] Modified polyacrylic acid resin, whose formula is as follows:

[0057] Acrylic acid 2 kg, acrylate monomer 4.5 kg (compound prepared by isooctyl acrylate and methyl methacrylate according to a mass ratio of 2:1), acetone 10 kg, initiator dibenzoyl peroxide 0.1 kg.

[0058] Modified polyacrylic resin was prepared according to the following steps:

[0059] Acrylic acid, acrylic ester monomer and 8 kg of acetone were mixed, and the temperature was raised to 80°C while stirring. The remaining acetone and initiator were added within 2.5 h while maintaining the temperature, and the reaction was maintained for 3 h. The temperature was lowered to 25°C, and a modified polyacrylic resin was obtained.

[0060] Preparation Example of glue

[0061] Preparation Example 1

[0062] Glue, the formula as follows:

[0063] Modified polyacrylic resin 500 g prepared in Preparation Example A, tannic acid 100 g, zinc powder 50 g, acetone 1 kg;

[0064] Glue, prepared according to the following steps:

[0065] Tannic acid and acetone were mixed and stirred for 10 min, and then the modified polyacrylic resin and zinc powder were added and mixed and stirred for 30 min to obtain glue.

[0066] Preparation Example 2

[0067] Glue, the formula as follows:

[0068] Modified polyacrylic resin 500 g prepared in Preparation Example B, tannic acid 100 g, zinc powder 50 g, acetone 1 kg;

[0069] Glue, prepared according to the following steps:

[0070] Tannic acid and acetone were mixed and stirred for 10 min, and then the modified polyacrylic resin and zinc powder were added and mixed and stirred for 30 min to obtain glue.

[0071] Preparation Example 3

[0072] Glue, the formula as follows:

[0073] Modified polyacrylic resin 500 g prepared in Preparation Example C, tannic acid 100 g, zinc powder 50 g, acetone 1 kg;

[0074] Glue, prepared according to the following steps:

[0075] Tannic acid and acetone were mixed and stirred for 10 min, and then the modified polyacrylic resin and zinc powder were added and mixed and stirred for 30 min to obtain glue.

[0076] Preparation Example 4

[0077] Glue, the formula as follows:

[0078] Modified polyacrylic resin prepared in Preparation Example D 500 g, tannic acid 100 g, zinc powder 50 g, acetone 1 kg;

[0079] Glue was prepared according to the following procedure:

[0080] The tannic acid and acetone were mixed and stirred for 10 min, then the modified polyacrylic resin and zinc powder were added and mixed and stirred for 30 min to obtain the glue.

[0081] Preparation Example 5

[0082] Glue was prepared according to the following procedure:

[0083] Modified polyacrylic resin prepared in Preparation Example E 500 g, tannic acid 100 g, zinc powder 50 g, acetone 1 kg;

[0084] Glue was prepared according to the following procedure:

[0085] The tannic acid and acetone were mixed and stirred for 10 min, then the modified polyacrylic resin and zinc powder were added and mixed and stirred for 30 min to obtain the glue.

[0086] Preparation Example 6

[0087] Glue was prepared according to the following procedure:

[0088] Modified polyacrylic resin prepared in Preparation Example A 800 g, tannic acid 250 g, zinc powder 150 g, acetone 2 kg;

[0089] Glue was prepared according to the following procedure:

[0090] The tannic acid and acetone were mixed and stirred for 10 min, then the modified polyacrylic resin and zinc powder were added and mixed and stirred for 30 min to obtain the glue.

[0091] Preparation Example 7

[0092] Glue was prepared according to the following procedure:

[0093] Modified polyacrylic resin prepared in Preparation Example A 700 g, tannic acid 200 g, zinc powder 100 g, acetone 2 kg;

[0094] Glue was prepared according to the following procedure:

[0095] The tannic acid and acetone were mixed and stirred for 10 min, then the modified polyacrylic resin and zinc powder were added and mixed and stirred for 30 min to obtain the glue.

[0096] Preparation Example 8

[0097] Glue was prepared according to the following procedure:

[0098] Preparation Example A yielded 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, 1kg of acetone, and 50g of aluminum acetylacetonate.

[0099] The glue is prepared according to the following steps:

[0100] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin, aluminum acetylacetonate and zinc powder, and mix for 30 minutes to obtain the glue.

[0101] Preparation Example 9

[0102] The adhesive has the following formula:

[0103] Preparation Example A yielded 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, 1kg of acetone, and 100g of aluminum acetylacetonate.

[0104] The glue is prepared according to the following steps:

[0105] Tannic acid and acetone were mixed and stirred for 10 minutes, then modified polyacrylic acid resin, aluminum acetylacetonate and zinc powder were added and mixed and stirred for 30 minutes to obtain the glue.

[0106] Preparation Example 10

[0107] The adhesive has the following formula:

[0108] Preparation Example A yielded 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, 1kg of acetone, and 50g of crosslinking agent (prepared by compounding polypropylene adipate and chitosan in a mass ratio of 1:5).

[0109] The glue is prepared according to the following steps:

[0110] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin and zinc powder, mix and stir for 30 minutes to obtain the glue.

[0111] Preparation Example 11

[0112] The adhesive has the following formula:

[0113] Preparation Example A yielded 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, 1kg of acetone, and 50g of crosslinking agent (prepared by compounding polypropylene adipate and chitosan in a mass ratio of 1:10).

[0114] The glue is prepared according to the following steps:

[0115] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin and zinc powder, mix and stir for 30 minutes to obtain the glue.

[0116] Preparation Example 12

[0117] The adhesive has the following formula:

[0118] Preparation Example A yielded 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, 1kg of acetone, and 50g of crosslinking agent (prepared by compounding polypropylene adipate and chitosan in a mass ratio of 1:2).

[0119] The glue is prepared according to the following steps:

[0120] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin and zinc powder, mix and stir for 30 minutes to obtain the glue.

[0121] Preparation Example 13

[0122] The adhesive has the following formula:

[0123] Preparation Example A yielded 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, 1kg of acetone, and 50g of crosslinking agent (prepared by compounding polypropylene adipate and chitosan in a mass ratio of 1:12).

[0124] The glue is prepared according to the following steps:

[0125] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin and zinc powder, mix and stir for 30 minutes to obtain the glue.

[0126] Preparation Example 14

[0127] The adhesive has the following formula:

[0128] Preparation Example A yielded 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, 1kg of acetone, and 150g of crosslinking agent (prepared by compounding polypropylene adipate and chitosan in a mass ratio of 1:5).

[0129] The glue is prepared according to the following steps:

[0130] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin and zinc powder, mix and stir for 30 minutes to obtain the glue.

[0131] Comparative example of glue preparation

[0132] Preparation of Comparative Example 1

[0133] The adhesive has the following formula:

[0134] Prepare 500g of modified polyacrylic acid resin, 100g of tannic acid, 50g of zinc powder, and 1kg of acetone obtained from Comparative Example a;

[0135] The glue is prepared according to the following steps:

[0136] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin and zinc powder, mix and stir for 30 minutes to obtain the glue.

[0137] Preparation of Comparative Example 2

[0138] The adhesive has the following formula:

[0139] Prepare 600g of modified polyacrylic acid resin, 50g of zinc powder, and 1kg of acetone obtained from Comparative Example A;

[0140] The glue is prepared according to the following steps:

[0141] The modified polyacrylic acid resin, zinc powder and acetone were mixed and stirred for 30 minutes to obtain the glue.

[0142] Preparation of Comparative Example 3

[0143] The adhesive has the following formula:

[0144] Prepare 550g of modified polyacrylic acid resin, 100g of tannic acid, and 1kg of acetone obtained from Comparative Example A;

[0145] The glue is prepared according to the following steps:

[0146] Mix tannic acid and acetone for 10 minutes, then add modified polyacrylic acid resin and mix for 30 minutes to obtain the glue.

[0147] Preparation of Comparative Example 4

[0148] The adhesive has the following formula:

[0149] Prepare 650g of the modified polyacrylic acid resin obtained from Comparative Example A and 1kg of acetone;

[0150] The glue is prepared according to the following steps:

[0151] The modified polyacrylic acid resin and acetone were mixed and stirred for 30 minutes to obtain the glue.

[0152] Example

[0153] Example 1

[0154] A vehicle warning label is produced according to the following steps:

[0155] The adhesive prepared in Preparation Example 1 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0156] Example 2

[0157] A vehicle warning label is produced according to the following steps:

[0158] The adhesive prepared in Preparation Example 2 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0159] Example 3

[0160] A vehicle warning label is produced according to the following steps:

[0161] The adhesive prepared in Preparation Example 3 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0162] Example 4

[0163] A vehicle warning label is produced according to the following steps:

[0164] The adhesive prepared in Preparation Example 4 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0165] Example 5

[0166] A vehicle warning label is produced according to the following steps:

[0167] The adhesive prepared in Preparation Example 5 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0168] Example 6

[0169] A vehicle warning label is produced according to the following steps:

[0170] The adhesive prepared in Preparation Example 6 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0171] Example 7

[0172] A vehicle warning label is produced according to the following steps:

[0173] The adhesive prepared in Preparation Example 7 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0174] Example 8

[0175] A vehicle warning label is produced according to the following steps:

[0176] The adhesive prepared in Example 8 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0177] Example 9

[0178] A vehicle warning label is produced according to the following steps:

[0179] The adhesive prepared in Preparation Example 9 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0180] Example 10

[0181] A vehicle warning label is produced according to the following steps:

[0182] The adhesive prepared in Preparation Example 10 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0183] Example 11

[0184] A vehicle warning label is produced according to the following steps:

[0185] The adhesive prepared in Preparation Example 11 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0186] Example 12

[0187] A vehicle warning label is produced according to the following steps:

[0188] The adhesive prepared in Preparation Example 12 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0189] Example 13

[0190] A vehicle warning label is produced according to the following steps:

[0191] The adhesive prepared in Preparation Example 13 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0192] Example 14

[0193] A vehicle warning label is produced according to the following steps:

[0194] The adhesive prepared in Preparation Example 14 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the markings of the warning label are printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0195] Comparative Example

[0196] Comparative Example 1

[0197] A vehicle warning label is produced according to the following steps:

[0198] The adhesive prepared in Comparative Example 1 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the warning label is printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0199] Comparative Example 2

[0200] A vehicle warning label is produced according to the following steps:

[0201] The adhesive prepared in Comparative Example 2 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the warning label is printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0202] Comparative Example 3

[0203] A vehicle warning label is produced according to the following steps:

[0204] The adhesive prepared in Comparative Example 3 is uniformly coated onto a substrate layer (PVC film), dried, and an adhesive layer is formed. Release paper is then adhered to the adhesive layer on the side away from the substrate layer to form a release paper layer. Finally, the warning label is printed on the side of the substrate layer away from the adhesive layer using rotary printing to obtain a vehicle warning label.

[0205] Comparative Example 4

[0206] A vehicle warning label is produced according to the following steps:

[0207] The adhesive prepared in Comparative Example 4 is uniformly coated onto a substrate layer (PVC film), dried to form an adhesive layer, and release paper is adhered to the side of the adhesive layer away from the substrate layer to form a release paper layer. Finally, the warning label is printed on the side of the substrate layer away from the adhesive layer by rotary printing to obtain a vehicle warning label.

[0208] Detection methods

[0209] The vehicle warning labels prepared in Examples 1-14 and Comparative Examples 1-4 were pasted onto steel plates, and the steel plates were baked at different temperatures. The temperature at which the vehicle warning labels curled up was recorded to characterize the high-temperature resistance of the vehicle warning labels. The higher the temperature at which the vehicle warning labels curled up, the better their high-temperature resistance. The specific test results are shown in Table 2 below:

[0210] Table 2. Performance Tests of Vehicle Warning Labels

[0211] Item Warpage temperature (°C) Item Warpage temperature (°C) Example 1 386 Example 10 432 Example 2 379 Example 11 437 Example 3 385 Example 12 402 Example 4 367 Example 13 405 Example 5 371 Example 14 433 Example 6 392 Comparative Example 1 304 Example 7 394 Comparative Example 2 298 Example 8 421 Comparative Example 3 274 Example 9 419 Comparative Example 4 241

[0212] As can be seen from Table 2, the temperature at which the vehicle warning label produced in the embodiments of this application exhibits warping is ≥367℃, which indicates that the vehicle warning label of this application has good high-temperature resistance.

[0213] Combining Example 1 and Comparative Example 1 with Table 2, it can be seen that the temperature at which the vehicle warning label prepared in Example 1 exhibits warping is much higher than that in Comparative Example 1. This may be because: the adhesive used in Comparative Example 1 comes from the preparation of Comparative Example 1, the modified polyacrylic acid resin in the preparation of Comparative Example 1 comes from the preparation of Comparative Example a, which does not contain N-allylcarbazole and vinylimidazole, while N-allylcarbazole and vinylimidazole both have high-temperature resistant cyclic structures. Therefore, the high-temperature resistance of the vehicle warning label prepared in Comparative Example 1 is inferior to that of Example 1.

[0214] Combining Example 1 and Comparative Examples 2-4 with Table 2, it can be seen that the temperature at which the vehicle warning label prepared in Example 1 exhibits curling is much higher than that in Comparative Examples 2-4. This may be because: the adhesive used in Comparative Example 2 does not contain tannic acid, the adhesive used in Comparative Example 3 does not contain zinc powder, and the adhesive used in Comparative Example 4 contains neither tannic acid nor zinc powder; while the adhesive used in Example 1 contains modified polyacrylic acid resin, tannic acid, and zinc powder. Zinc powder itself has good high-temperature resistance. Tannic acid can crosslink with the modified polyacrylic acid resin through hydrogen bonds and chelate with zinc powder to form a highly crosslinked network structure. This highly crosslinked network structure has good high-temperature resistance and also improves the dispersion performance of zinc powder in the adhesive, fully utilizing the high-temperature resistance of zinc powder.

[0215] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A vehicle warning label, characterized in that: It includes a release paper layer and a substrate layer, which are bonded together by adhesive; The adhesive is composed of the following raw materials in parts by weight: 50-80 parts modified polyacrylic acid resin, 10-25 parts tannic acid, 5-15 parts zinc powder, 5-10 parts aluminum acetylacetonate, and 5-15 parts crosslinking agent; the modified polyacrylic acid resin is made from the following raw materials in parts by weight: 15-25 parts acrylic acid, 5-10 parts N-allylcarbazole, 5-10 parts vinylimidazole, and 40-60 parts acrylate monomers. The crosslinking agent is a compound of poly(propylene adipate) and chitosan in a mass ratio of 1:

10.

2. A vehicle warning label according to claim 1, characterized in that: The modified polyacrylic acid resin is 70-80 parts by weight.

3. A vehicle warning label according to claim 1, characterized in that: The zinc powder is in the form of 10-15 parts by weight.

4. A vehicle warning label according to claim 1, characterized in that: The acrylate monomers are one or more of butyl acrylate, isooctyl acrylate, hydroxypropyl acrylate, and methyl methacrylate.

5. A vehicle warning label according to claim 4, characterized in that: The acrylate monomers are compounded from isooctyl acrylate and methyl methacrylate in a mass ratio of (2-5):

1.

6. A method for preparing a vehicle warning label according to any one of claims 1-5, characterized in that: Includes the following steps: The adhesive is applied to one side of the substrate layer and dried to form an adhesive layer. Release paper is then adhered to the adhesive layer on the side away from the substrate layer to form a release paper layer. Finally, a warning label is printed on the side of the substrate layer away from the adhesive layer to obtain a vehicle warning label.